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Anisotropic Variation Law of Rock Permeability with the Burial Depth of Limestone

机译:岩石渗透率随石灰岩埋深的各向异性变化规律

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Permeability tensors of both macrofracture and microfracture Systems were measured progressively along the depth of limestone formations at severed sites. It was found that the principal permeability values K_x, K_y and K_z in these permeability tensors all decrease simultaneously and logarithmically with depth. However, the limestone aquifers are composed of an upper region where the larger permeability ellipsoid is upright or prolate and characterized by K_z>K_x and K_z>K_y, a transitional zone, and a lower zone whose smaller permeability ellipsoid is horizontal or oblate and characterized by K_z>K_x and K_z>K_y. The inversion of the permeability ellipsoids in direction indicates that the anisotropy of rock permeability with the depth of limestone formations has evidently changed. The anisotropic variation law of permeability tensors in a macrofracture system displays a similar pattern with that in a microfracture system. It is next to impossible to examine the rock permeability tensor of the aquifer just by measuring the hydraulic parameters of macrofracture system directly, unless the limestone aquifer is exposed on or near the earth's surface. Therefore, the permeability tensors of a macrofracture system at any depth may be indirectly and roughly determined from the gaugeable permeability tensors of the microfracture system by conversion. This anisotropic variation law of rock permeability with depth is of great significance in the study of three-dimensional fracture water flow the huge carbonate formations and in the research on the conditions of karst development and karst distribution.
机译:沿断裂部位的石灰岩地层深度逐步测量了宏观裂缝和微裂缝系统的渗透率张量。已经发现,这些渗透率张量中的主要渗透率值K_x,K_y和K_z都同时且随着深度对数减小。然而,石灰岩含水层由上部区域组成,该区域上部较大的渗透率椭球体是直立的或扁平的,其特征在于K_z> K_x和K_z> K_y,一个过渡区域,下部区域则具有较小的渗透率椭球体是水平的或扁圆形的,其特征在于K_z> K_x和K_z> K_y。渗透率椭球的方向反转表明,岩石渗透率的各向异性随石灰岩地层的深度而发生了明显变化。大裂缝系统中渗透率张量的各向异性变化规律显示出与微裂缝系统中相似的规律。仅通过直接测量宏观裂缝系统的水力参数来检查含水层的岩石渗透性张量几乎是不可能的,除非石灰岩含水层暴露在地球表面上或附近。因此,可以通过转换从微裂缝系统的可测渗透率张量间接地和粗略地确定大裂缝系统在任何深度的渗透率张量。岩石渗透率随深度的各向异性变化规律对三维裂隙水流中巨大碳酸盐岩地层的研究以及岩溶发育和岩溶分布条件的研究具有重要意义。

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